1 Session The Session layer is responsible for connection negotiation and establishment. The Session Control module performs the following functions: o Manages transport connections on behalf of Session Control users. o Enforces access control policies to restrict communication between users and between Session Control modules. o Maps from a DNA Naming Service object name to protocols and addresses. o Selects from the set of protocols supporting Session Control to attempt connection establishment. o Maintains in the namespace the protocol and address information corresponding to objects that reside in the same node as the local Session Control module. The hierarchy of Session Control Module Entities is shown with indentation as follows: Session Control Applications Ports Tower Maintenance Transport service Backtranslation softlink The Session Control entity is the top-level entity in the hierarchy of entities belonging to the Session Control module. 2 character =title Characteristic Attributes ADDRESS UPDATE INTERVAL Default: 10 Value: 1-4294967296 Minimum time, in seconds, allowed between updates of address information. More frequent modification to the set of local towers is prohibited. BACKTRANSLATION SEARCH PATH Describes the order in which name services will be searched for address-to-node-name translation requests when more than one name service is in use on a node and any associated naming templates for each directory service. INCOMING PROXY Default: True Value: Boolean Specifies whether to honor incoming proxy requests. If this attribute is set to false, requests to invoke proxies on incoming requests are ignored. INCOMING TIMER Default: 45 Value: 0-65535 Time, in seconds, to wait for a user module to issue an accept/reject call after a port enters a state indicating that a connection request was received. If the timer expires, Session Control aborts the transport connection with a timed out error. For OpenVMS, a zero 0 value directs Session Control to wait indefinitely without aborting the connection. MAINTAIN BACKWARD SOFT LINKS Default: False Value: Boolean Specifies whether Session Control should attempt to update the backward translation soft links when it detects an address change. If this attribute is set to false, Session Control will add no new backward translation soft links and it may delete any that it has created. MODIFY ACS CONTROL SET Default: True Value: Boolean Specifies whether Session Control should attempt to update the ACS access control set of the node object whenever it attempts to update the towers attribute for the node in the namespace. NAMING CACHE CHECKPOINT INTERVAL Amount of time, in hours, between times when the address and node-name information is checkpointed to disk from the in-memory, local naming cache. ! NAMING CACHE ENTRY ! ! Address and node-name information for a node that has been retrieved from ! a name service and is currently stored in the in-memory, local naming ! cache. ! ! NAMING CACHE TIMEOUT Amount of time, in days, after which the address and node-name information for a node is deleted from the in-memory, local naming cache. NAMING SEARCH PATH Describes the order in which name services will be searched for node-name-to-address translation requests when more than one name service is in use on a node, and any associated naming templates for each name service. NON PRIVILEGED USER Specifies the Session Control on a non-privileged user account. SOFTLINK TIMER Default: 30 days Value: binary relative time Interval of time, in days, DECdns checks that an object pointed to by a backward translation soft link still exists. OUTGOING PROXY Default: True Value: Boolean Specifies whether to invoke a proxy on outgoing connection requests when the user does not explicitly specify to do so. If this attribute is set to false, no proxy is invoked. OUTGOING TIMER Default: 60 Value: 0-65535 Time, in seconds, to wait for an outgoing transport connection to be accepted before Session Control aborts the connection with a timed out error. For OpenVMS, a zero 0 value directs Session Control to wait indefinitely without aborting the connection. UPDATE RETRY INTERVAL Default: 60 Value: 1-4294967296 Time to wait before Session Control retries a failed attempt to update information in the namespace. The default is 60 minutes. ! TRANSPORT PRECEDENCE ! Default: OSI Value: Set of OSI or NSP ! ! Sets the order in which transports are selected when establishing a ! connection. The default order is to try OSI, then NSP. The command takes a ! set as input. Valid items in the set are Session Control ! transport service entity names. ! ! VERSION Session Control protocol version number. You cannot modify this characteristic. 2 Counter =title Counter Attributes ACCESS CONTROL VIOLATIONS Number of times Session Control has detected an access control violation event. BACKTRANSLATION DELETIONS Number of times Session Control has detected a backtranslation deletion event. BAD BACKTRANSLATION LINKS Number of times Session Control has generated a bad backtranslation link event. DANGLING LINK Number of times Session Control has detected a dangling link event. DELETED MAINTAINED OBJECTS Number of times Session Control has detected a deleted maintained object event. VERIFICATION FAILURES Number of times Session Control has detected a verification failure event. 2 status =title Status Attributes BACKTRANSLATION DIRECTORY Name of the root directory of the backtranslation tree. STATE Status of the Session Control entity.